Finding the Fourth Proportional to 7,440.50, 10,267.90 and 4,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,440.50 : 10,267.90 = 4,128.50 : x
2. Step 2: Convert to fraction form
   7,440.50/10,267.90 = 4,128.50/x
3. Step 3: Cross multiply
   7,440.50x = 10,267.90 × 4,128.50
4. Step 4: Simplify right side
   7,440.50x = 42,391,025.15
5. Step 5: Solve for x
   x = 42,391,025.15/7,440.50
6. Step 6: Final answer
   x = 5,697.34